| Name | Meaning | Gender | Origin |
|---|
| Mandy | Harmony | Female | English |
| Maniac | | Male | Hebrew |
| Marbles | Irregularly coloured rock. Balls usually made of glass used as a children's game. | Male | |
| March | Walk Forth | Male | Latin |
| Mayhem | | Male | Hebrew |
| Mikey | | Unisex | |
| Mimi | Form of Williamina
| Female | English |
| Mimi | Form of Williamina
| Female | English |
| Mischief | One that causes minor trouble or disturbances | Male | |
| Mitzi | bitter | Female | |
| Mocha | Coffee of high quality. | Female | Arabic |
| Monster | A creature of frightening appearance | Unisex | |
| Montgomery | mountain hunter | Male | |
| Murphy | Sea warrior | Male | Irish |
| Mustang | | Unisex | Hebrew |
| Nacho | Small triangles of tortilla topped with cheese. | Male | Word |
| Neutron | | Unisex | Hebrew |
| Nike | victory | Male | Greek |
| Ninja | | Male | |
| Nitro | Short for Nitroglycerin a highly explosive liquid. | Male | |
| Noodle | A narrow ribbon-like strip of dough | Unisex | |
| Nova | A star that suddenly becomes much brighter. | Female | Latin |
| Nsync | | Unisex | Hebrew |
| Nuisance | | Male | Hebrew |
| Onomatopoeia | | Unisex | Hebrew |